Radiation effects on potential number of grains per spike and biomass partitioning in two- and six-rowed near isogenic barley lines

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• 作者：Sebastiá ; n Arisnabarreta ; Daniel J. Miralles
• 关键词：Near isogenic lines ; Shading ; Floret primordia development ; Partitioning ; Two- and six-rowed barleys (Hordeum vulgare L.)
• 刊名：Field Crops Research
• 出版年：2008
• 出版时间：3 June 2008
• 年：2008
• 卷：107
• 期：3
• 页码：203-210
• 全文大小：609 K

文摘

The critical period for yield determination in barley (Hordeum vulgare L.) is situated in the pre-heading phases. During the latest part of the critical period one of the most important yield components (i.e. the number of grains per spike) is set in two- and six-rowed barley. In wheat, much is known about the role of the spike in assimilate acquisition for the establishment of grains per spike, but not in barley. This paper evaluates how biomass partitioning between vegetative and reproductive organs impacts floret development and primordia survival in response to radiation during different periods in the crop cycle, in barley lines. Field experiments were carried out using two- and six-rowed near isogenic barley lines differing only in spike type. Shading treatments were applied at different periods during the crop cycle (from 60 to 15 days before and after heading) reducing the intercepted radiation (ca. 70 % ). Dynamics of floret primordia initiation and mortality and of floret development for different spikelet positions along the spike were measured, and biomass partitioning between vegetative and reproductive structures was calculated.